Cylindrical grinding attachment for surface grinders



Sept. 27, 1 w. L. DOLPH ET AL' CYLINDRICAL GRINDING ATTACHMENT FOR SURFACE GRINDERS Filed April 7, 1930 3 Sheets-Sheet 1 11v VENTORS I b MRNERL,DOLFf/ B Y i iRMA/v H, LEV/J %74A TTORNEY i Sept. 27, 1932. w. DOLPHET AL 1,879,134

CYLINDRICAL GRINDING ATTACHMENT FOR SURFACE GRINDERS Filed April '7. 1930 3 Sheets-Sheet 2 Will/111%) [1V VENTORs BY NORMA/V h, LEW/J 22%;: TTORNE Y p 27, 1932- w. 1.. DOLPH ET AL 1,379,134

CYLINDRICAL GRINDiNG ATTACHMENT FOR SURFACE GRINDERS Filed April 7, 1950 5 Sheets-Sheet 5 INVENTORS MMWER L 170L7 6 a? B Y NORMA/V H. LEI/l5 flQWATTORNEY Patented Sept. 27, 1932 UNITED STATES A T/ CE Y 7 \VARNER L. DOLPH AND NORMAN H. LEWIS, OI ROCHESTER, NEW YORK CYLINDRICAL GRINDING ATTAI ZMENT SURFAGE GRINDE RS Application filed Apri1'7, 1930. SerialNo. 442,319.

This invention relates to attachments for surface and universal grinders and has for its various objects:

To provide an attachment 5 of grinders to make it possible to do cylindrical grinding therewith. 7

To provide an attachment which can be readily attached to the bed plate of a surface or universal grinder so that cylindrical work 10 can be mounted and rotated thereon in any desired angular position with relation to the axis of rotation of the grinding wheel of the surface or universal grinder.

' To provide an attachment for supporting cylindrical work on the bed plate of a surface or universal grinder including means for rotating the cylindrical work while supported by the attachment.

These and other objectsof this invention will be apparent from the drawings, the

specification and the appended claims form ing a part thereof. 7 In the accompanying drawings: Figure 1 is a front elevation of thecylindrical grinding attachment as .it appears mounted on the bed plate of a surface or universal grinder, the motive power for the attachmentbeing furnished by an electric motor forming part of the attachment.

Figure 2 is an end elevation of the cylindrical grinding attachment and associated parts illustrated in Figure 1. Figure 3 is a vertical sectional view of a modified form of the cylindrical grinding attachment for surface grinders in which the motive power for the operation of the attachment is transmitted fromthe counter shaft by means of a train of belts and pulleys. Figure a is an end elevation of the upper portion of the cylindrical grinding attachment illustrated in Figure 3 illustrating the. manner in which it is used for grinding rod stock.

a Figure 5 is a front elevation of the cylindrical grinding attachment illustrated in Figure 3.

In the several figures of the drawings like reference numerals indicate like parts. I

The cylindrical grinding attachment forming the subject matter of this invention for these types,

is especially; adapted for use with'surface grinders whereby this type of grinder, which has heretoforeonly been used for grinding straight work, can now be used for grindingcylindrical work as well. Many machine and tool shops, especially the smaller ones, are equip ed with surface grinders only because I they ave not enough 'cylindrical work to warrant the investment in a cylindrical grinding machine. All cylindrical grinding except some that can be done in a lathe m'ust therefore be let out to a manufacturer who is equippedwith cylindrical j grinding machines; Our present invention, however, makes it possible to transform a surface grinder into a cylindrical grinder so; that both. surface and cylindrical, grinding can be done onthe same machine, and, what is more, the type of machine with which practically every shop is equipped.

As illustrated in'Figures 1 and 2 theattachrnent is mounted on the bed plate. 1 of the surface grinder. When'the, grinder is used for surface grinding this bed plate moves back and forth in front of the ver tically adjustable spindle 2 carrying the grinding wheel 3. The spindle2 is adjusted vertically by raising and lowering the spindlew carriage 2A in the frame of the grinder. As illustrated inFigure 3' the spindle 2 is mounted to rotate in the spindle carriage 2A near the lower end of it and the carriage is adapted. to be raised and lowered in suitable guides 2B and 26 provided the grinder frame on each side of the carriage. With the attachment, which will hereinafterbe described, the bed plate, after it-is-adjusted, is locked so that it cannotmove back and I forth but remains stationary. The bed plate 1 however remains adjustablein and out or toward and away from in front of the grinding wheel and for this purpose is mounted to slide in the tracks 4 and 5 illustrated in Figure 2. The cylindrical grinding attach- H. ment is firmly clamped in its desired. position to the bed plate 1 by means of one or moresuitable clamps in which position the grinding wheel 3 will operate to grind the cylindrical surface when brought in contact d therewith. 1

onto which the face plate 13 is adapted to The cylindrical grinding attachment comprises a standard having the base 6 and the upright member 7. The base 6 is suitably machined to provide a flat surface on the bottom of it so that it rests solidly on the surface of thebed plate to which it is clamped. At the top of the upright member 7 is located the spindle housing 8 in which suitable ball bearings 9 and 10, illustrated in Figures 3 and 4t, rotatably support the hollow spindle 11; On the outer end, this spindle carries the threaded collar 12 be threaded as illustratedin Figure 3.

In the construction of the attachment illustrated in Figures 1' and2 a groove 14: is provided in the periphery of the face plate 13. A belt 15 is adapted to travel inthis groove around the face plate and over the pulley 16 located'adjacent to theface plate and carried on the shaft 17. This shaft is mounted to rotate in a suitable bearing provided in the upright member 7 and carries on the opposite end the cone pulley 18, The

electric motor 19 which is mounted on a suitable extension of the base 6 is provided with a'cone pulley 2O whichis in line with the cone pulley 18 so that a be'lt21 can pass from one cone pulley to the other thru an opening in the reinforcing rib "22 provided at the back of the upright member 7 The cone pulleys are used in order to permit a change in thespeed of the work to be ground by means of the attachment. f

The work to be ground'is suitably centered and clamped to the face plate 13 as illustrated in Figures 1, 2 and 3 inwhich reference numeral 23 indicates a ring member which isclamped to the face plate to be ground either onthe inside or outside parallel to the axis of rotationof the ring member. After the work is clamped in-place onthe face plate the bed plate 1 of the surface grinder is moved laterally to a position in which thegrinding wheel 3 is properly located for the grinding'operation with relation to'the work supported on the attachment. When this is done the bed plate is locked against further lateral movement and is then moved toward the grinding wheel to bringthegrinding wheel in contact-with the work. Before the work is brought in contact with the rotating grinding. Wheel itis rotated and kept in rotation by the motor 19 as if it were mounted in a cylindri'cal grinding apparatus. The vertically adjustable spindle 2f carrying the grinding wheel 3 is. adjusted to allowthe wheel to grind off the desired amount from the rotating work as it is being fedlongitudinally the grinding wheel. Of course only a predetermined [amount of stock can be ground off the work atone time and in order to grind of? more than that the attachment must be repeatedly moved longitudinally to ward and away from the grinding wheel and the vertical position of the grinding wheel adjusted to make the grinding wheel grind an additional layer from the work each time the face plate.

For small work especially rod stock which is used forfpins, small punches etc. the speed transmitted from the motor to the face plate is too slow. Such stock is held in place by means of a collet 25 which is mounted in the hollow spindle 11 and is operated by the handle projecting from the rear of the spindle as illustrated in Figure 4. The rod stock 2 7 is placed into the collet 25 and left projecting from it the desired length, the surface of which is to be ground. The collet is then operated by means of the handle 26 to firmly hold the stock in place in the collet.

The'face plate 13 is replaced for this work by a small pulley 28 which is threaded onto the collar 12 of the spindle 11. The belt 15 is then suspended between the pulley 16 and the pulley 28 so that on the rotation of the pulley 16 the work held in the collet is rotated at a much higher rate of speed in order to give the perimeter of the rod stock to be ground the proper peripheral speed for grinding.

In the modified form of the attachment illustrated in Figures 3, 4 and 5 the power for rotating the face plate or thespindle with the collet is taken from an over head shaft 30. This may be the line shaft or the transmission shaft of the grinder and on this shaft is mounted the cone pulley 31. A belt 32 passes from the cone pulley 31 to the cone pulley 33 splined on the sleeve 34. The cone pulley 33 is thus free to slide back and forth on the sleeve 34 while rotating it and the pulley 16 provided at the inner end of it. The sleeve '34: is mounted to rotate on the stud 35 which is carried at the outer end of the radial arm 36. This arm, as illustrated in Figure '5, has a split hub 37 which is mounted on the end of the spindle housing 8. A suitable clamping screw 38 is provided on the side of the hub with which the hub can be contracted to firmly clamp it in a desired angular position on the spindle housg with relation to the spindle mounted to ratate therein. pulley can thus be adjusted so that the belt 32 'willoperate' the pulley whether the "attachment islocated at one sideor the other ofthe center of the cone pulley 31..

;The fact'that the cone pulley 33 issplined The location of the cone on the sleeve permits this pulley to automatically adjust itself laterally thereon when the attachment is moved toward and away from the grinding wheel and thus retain its relative position to the driving pulley 31 which is fixed on the shaft 30. 1

Vhile the attachment has been described as being attached to the bed plate of the surface grinder with the axis of rotation of the spindle parallel with the axis of rotation of the spindle carrying the grinding wheel it can readily be seen that the attachmentmay be mounted in any angular position thereto so that not only straight work but angular 0r conical work may be ground with this attachment equally well.

As illustrated in Figure 3 the cylindrical grinding attachment may be mounted on the bed plate so that its spindle 11 will be at right angles to the spindle 2 of the grinding wheel. The attachment is used in this position when it is desired to face off the front or face of the work mounted on the face plate 13.

WVe claim:

1. The combination with a grinding machine having a vertically adjustable rotating grinding wheel and abed plate adapted to be adjusted laterally with relation to said grinding wheel and moved longitudinally toward and away from said grinding wheel, of an attachment comprising a standard adapted to be clamped in place on said bed plate driving means fixedly supported on said standard, a hollow spindle mounted torotate in said standard, work holding means provided within and without said hollow spindle; and pulley means carried by the work supporting end of said hollow spindle and surrounding the work holding means and connected to said driving means to rotate said hollow spindle independent of said grinding wheel while moving the attachment with the bed plate toward and away from the grinding wheel and bringing the grinding wheel in frictional contact with the work. supported by said attachment.

2. The combination with a grinding machine having a vertically adjustable rotating grinding wheel and a bed plate adapted to be adjusted laterally with relation to the grinding wheel and adapted to be moved longitudinally toward and away from said grinding wheel, of a standard having a base driving means fixedly supported on said standard, a spindle mounted to rotate in said standard, means for fastening said base to said bed plate to support said spindlein a predetermined angular position with relation to the axis of rotation of said grinding wheel, work holding means provided at one end of said spindle and means encircling said work holding means for rotating said spindle independent of the rotation of said grinding wheel by means of said driving means.

3. The combination with a grinding machine having a vertically adjustable rotating relation tothe axis of rotation'of the grind-F ing wheel, of'an attachment comprising a base havingan upright driving meansfixedly supported on said upright, aspindle mounted to rotate in said upright combined pulleyand work holding means at one end of said spin-l dle, a pulley mounted adjacent to said spindle Li and parallel thereto adapted to be driven by said driving means, drivinggmeans for said pulley and a belt connecting said pulley with said combined pulley to rotate said spin-"w dle on the rotation of said pulley and work holding means; r I i V 4. The combination with a grinding machine having a vertically adjustable rotating grinding wheel and a bed plate adapted to my be adjusted laterally and longitudinally with relationto the-axis of rotation of the grind? ing wheel, of" an attachment having a base,

an upright on said base, a spindle housing supported by said upright, a hollow spindle '20) mounted to rotate in said spindle housing, work holding means carried by said hollow spindle, a pulley mounted to rotate on said upright parallel to said spindle and pulley means encircling said work holding means to support a belt extending from said pulley to said spindle and rotate said spindle on the rotation of said belt, and means for rotating said pulley.

5. The combination with-a grinding machine having a vertically adjustable rotating grinding wheel and a bed plate adapted to be adjusted laterally and longitudinally with v relation to the axis of rotation of the'grinding wheel, of anattachment having a base M5 adapted to be fastened to said bed plate, an upright on said base, a' spindle housing supported by said upright, a spindle mounted to rotate insaid spindle housing, an arm pivoted on said spindle housing concentric to said spindle, a pulley mounted to rotate on said arm, means provided on said spindle to support a belt between said pulley and said spindle, and means provided on said spindle for supporting work thereby and rotate therewith and means for rotating said pulley. 6. The combination with a grinding ma chine having a vertically adjustable rotating grinding wheel and a bed plate adapted to be adjusted laterally and longitudinally with relation to the axis of rotationof the grinding wheel, of an attachment having a base adapted to be fastened to said bed plate, an upright on said base, a spindle bearing supported by said upright, a spindle mounted to rotate in said spindle bearing, an arm pivoted on said spindle bearingconcentric to said spindle, a stud carriedby said arm, a sleeve mounted to rotate on said stud, a pulley carried by said sleeve, a second pulley splined a to said sleeve and adapted to move back and forth thereon, means for rotating said sec- 0nd pulley and means carried by said spindle to support a'belt between it and said first p named pulley to rotate said spindle on the rotation of said second named pulley.

7 The combination with a grinding machine having a vertically adjustable rotating grinding Wheel and a laterally and longitudinally movable bed plate with relation to l the axis of rotation of said grinding wheel, of an attachment having a supporting base, amounting surface on said base adapted to be clamped to said bed plate to hold said 315' base in a predetermined horizontally angular position on said bed plate, a motor mounted on said base behind said upright, a shaft mounted in said upright parallel to said spindle, a pulley carriedbysaid shaft, means 520 connecting said shaft with said motor to rotate said shaft on the rotation of said motor,

a combined face plate and pulley provided on the supporting'endof said spindle and a belt connecting said pulley with said face 8. The combination with a grinding machine having a vertically adjustable rotating grinding wheel and a laterally and longitudinally movable bed plate with relation to the axis of rotation of said grinding Wheel, of an attachment having a supporting base, a mounting surface on said base adapted to be clamped to said bed plate to hold said base in a predetermined horizontally angu- Qjfl lar position on said bed plate, a standard on said base, a spindle mounted in said standard, a motor mounted on said base, a pulley driven by said motor, work holding means provided on'said spindle, pulley means surrounding said Work holding means, and a belt connecting said pulley with said pulley means to rotate said spindle on the movement of said attachment toward and away from the grinding Wheel.

In testimony whereof we affix our signatures.

NORMAN H. LEl/VIS. WVARNER L. DOLPH. 

